Question

How to do that with ActiveRecord? My code:

p = Product.create
l = Label.create
p.labels.add << l

But I get l.parent == nil

  create_table "labels", :force => true do |t|
    t.integer  "product_id"
  end

Answer 1

Some code from you would be appropriate, since what you re asking should be working automatically.

class Parent < ActiveRecord::Base
  has_many :children
end

class Child < ActiveRecord::Base
  belongs_to :parent
end

If your code doesn t resemble that, then please post a more specific question.

Edit: Does your Product model have any validations in it? They aren t going to pass your code above, and you aren t checking the return value from create, so you ll never know.

Answer 2

You could use acts_as_tree for this: http://github.com/rails/acts_as_tree

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